Development of deconvolution analysis on the temperature programmed desorption mass spectrometry

Abstract

In the temperature programmed desorption-mass spectrometry (TPD-MS) experiments, the time lag and broadening of the gas evolved from the sample until it is detected by the MS detector can be a problem. The deconvolution method was successfully applied to TPD-MS. The pulse injection of N2, 1-butene, CO2, and H2O gasses in the TPD-MS system showed the same MS intensity-time response. This result suggests the MS signal can be used as an impulse response function of deconvolution analysis. The present TPD-MS method was applied to evaluate the dehydration from zeolites during heating. The shape of differential thermogravimetry (DTG) curves was in good agreement with deconvolved TPD-MS curves. The signal-to-noise ratio of TPD-MS is higher than that of DTG. The present method can be applicable for TG-MS or Fast scanning calorimetry (FSC)-MS in the upcoming study.

Keywords

• Deconvolution
• Adsorbed water
• Activation energy
• Kinetics